1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5bba3966ce78a8717c9c70642620d26b04099bd8d6571f1db46b87ddc5a32ee. Chain 2 (Bitcoin): anchored in block 953758 (2026-06-15T07:48:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b275dd32-e63e-4481-94f6-6f85dce1f596.json and https://artists.proofprofile.net/proofs/artist/b275dd32-e63e-4481-94f6-6f85dce1f596.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Turquie - Turkey: Ud, Oud & Kanoun (Air Mail Music Collection)
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0b16d6e873ec5ed6e443503430b8c830b3742e5cb894b4c981bfd335f908ed7. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR6V80509511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0c70a7e0f5a4e1f178147f3398ae2d1cb81a936d2113e9eaa9bd286e6a954ac. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR6V80509512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4a97889c4901c4e38376e86b45d0400210c7bbb341268cf7cc84658b4038b33. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR6V80509513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf43a895389c7f99bc7c70cfe4238abe89e16e4704daeb92d786e0108943abefd. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR6V80509514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa20789b6ff66ec5272f68e82bbccf5d62d486149de7b416b3777d91eb154126b. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR6V80509515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46f3e955cc45e570d7f2de2f1d2bafeedead177e3b10118bf8e8fce4081aa53c. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR6V80509516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55f507e3f01b789fd284056d6b57a72425c530145758432feb1ed90a9d388b1a. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR6V80509517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0425084655da3463d3ce850401de769fd7e592f886db936714e39b0f170d6536. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR6V80509518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x824f40b6239ce07b79b3c9fc96e0d45067baaaec3d365dbebd01054312e2afdf. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR6V80509519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fee880ed03a1a9714b4bbae021dd3f90ce5a05eb36993d3e291cc07da88e8ea. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR6V80509520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48c134b1dba561eab4a90d7b2dee77ffd6b5f224542c5f078ebf4deac2b995a3. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR6V80509521.
Turquie - Turkey (Air Mail Music Collection)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8886b19df4d1ad3a845b86cf2f77be584608ad5032116c4354237c26d8484b8. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR6V89802241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84c0e00263a346f678bc95293b0a2bf80db1ff4249bf6542ce7bcf58cbfff41a. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR6V89802242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3190f7d8dcee48b7712913d89c036d1ca95ac0f8d31f3379f3b7f58c5efbfcd0. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR6V89802243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab2ce3281e29bee1a53e0f82d61b6719b62390a75b4fa41fa22b928f0fbace1f. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US83Z2313739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40782b5340dd30e729e794b14e7b457ac67ae7556d8a4f8838c39e5c64f93ea3. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US83Z2313740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0ce10787accccbdbc6cae0dca5ff89afc817fca2fe64b37e35a7df541ffb2ed. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US83Z2313738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb520c7710d531c1e7a767eb84d8e5c4d625fceeada3e6cea0bee6920f32c0653. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US83Z2313737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x437d8256a72658e405ce637c9e7ccf0e5ec95b4b013f5fe8bd2e906fa43a8151. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US83Z2313736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecdb81ae0849f2f0ada495b39f0cc4fa27aefefe358c00324ebd0d1ce4058038. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US83Z2313735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb31468cff4ba1ad717f3f8e97f9275878088f92f0d7302e98f7c0582eec36dd. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US83Z2313734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e3336ceab9c27bf24018ec7f0f6028054ababdedcc30ab48eac05068b8c6760. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US83Z2301920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x841fdaaec9e4c71a61ac16e28d051cf5e2524dade1e97201e3cd25cfaae09ad8. Chain 2 (Bitcoin): anchored in block 960277 (2026-07-30T16:10:47Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US83Z2300237.
Fiddler on the Roof (Theme from Fiddler on the Roof) [(Arr. Willem Vogel)]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5013d7d6f21f20ece89a802a68e7e57d4ddc7c8d577cdf08596ccb5ee61a753. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM22008158.
Verbunk un Friss : Invitation to the Dance (Arr. Willem Vogel)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7014b670ce48f824af5b8252f43c8443bbbbe1e6727bcb8083b1bdec98918e20. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM22008170.